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Following the service at Goxhill, Mary has begun her 5km journey across the Humber to Paull.

It is expected to take around a year before Mary comes out on dry land in the East Riding village.

A National Grid spokeswoman said: “The tunnelling machine has now been assembled on site and, in the next few weeks, will begin a 5km, year-long journey under the river to emerge on the north bank at Paull.

“It will create a 3.65m diameter tunnel as it travels, around 35m below the river bed.

“Once the tunnel is finished, a new 42in diameter gas pipeline will be laid inside it to replace an existing one.

The huge machine is digging a tunnel to be used for a new gas pipeline

“The gas pipeline, which currently crosses the river, is laid in a trench just below the river bed, but is at risk of being exposed by shifting tides.

“Work has been carried out to keep it buried, but the Humber Pipeline Replacement project offers a long-term solution.”

National Grid has awarded the £100m contract to build the tunnel to a joint venture made up of Skanska, PORR Bau GmbH and A. Hak.